1 ;;; Copyright (c) 2016 Cisco and/or its affiliates.
2 ;;; Licensed under the Apache License, Version 2.0 (the "License");
3 ;;; you may not use this file except in compliance with the License.
4 ;;; You may obtain a copy of the License at:
6 ;;; http://www.apache.org/licenses/LICENSE-2.0
8 ;;; Unless required by applicable law or agreed to in writing, software
9 ;;; distributed under the License is distributed on an "AS IS" BASIS,
10 ;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11 ;;; See the License for the specific language governing permissions and
12 ;;; limitations under the License.
14 ;;; tunnel-decap-skel.el - tunnel decapsulation skeleton
18 (define-skeleton skel-tunnel-decap
19 "Insert a tunnel decap implementation"
21 '(setq encap_stack (skeleton-read "encap_stack (e.g ip4_udp_lisp): "))
22 '(setq ENCAP_STACK (upcase encap_stack))
23 '(setq encap-stack (replace-regexp-in-string "_" "-" encap_stack))
24 '(setq ENCAP-STACK (upcase encap-stack))
26 #include <vlib/vlib.h>
27 #include <vnet/pg/pg.h>
28 #include <vnet/" encap-stack "/" encap_stack ".h>
34 " encap_stack "_header_t h;
35 } " encap_stack "_rx_trace_t;
37 static u8 * format_" encap_stack "_rx_trace (u8 * s, va_list * args)
39 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
40 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
41 " encap_stack "_rx_trace_t * t = va_arg (*args, " encap_stack "_rx_trace_t *);
43 if (t->tunnel_index != ~0)
45 s = format (s, \"" ENCAP-STACK ": tunnel %d next %d error %d\",
46 t->tunnel_index, t->next_index, t->error);
50 s = format (s, \"" ENCAP-STACK ": no tunnel next %d error %d\\n\",
51 t->next_index, t->error);
53 s = format (s, \"\\n %U\", format_" encap_stack "_header_with_length, &t->h,
54 (u32) sizeof (t->h) /* max size */);
59 " encap_stack "_input (vlib_main_t * vm,
60 vlib_node_runtime_t * node,
61 vlib_frame_t * from_frame)
63 u32 n_left_from, next_index, * from, * to_next;
64 " encap_stack "_main_t * ngm = &" encap_stack "_main;
65 u32 last_tunnel_index = ~0;
66 " encap_stack "_tunnel_key_t last_key;
67 u32 pkts_decapsulated = 0;
69 memset (&last_key, 0xff, sizeof (last_key));
71 from = vlib_frame_vector_args (from_frame);
72 n_left_from = from_frame->n_vectors;
74 next_index = node->cached_next_index;
76 while (n_left_from > 0)
80 vlib_get_next_frame (vm, node, next_index,
81 to_next, n_left_to_next);
83 #if 0 /* $$$ dual loop when the single loop works */
84 while (n_left_from >= 4 && n_left_to_next >= 2)
87 vlib_buffer_t * b0, * b1;
88 nsh_unicast_header_t * h0, * h1;
93 /* Prefetch next iteration. */
95 vlib_buffer_t * p2, * p3;
97 p2 = vlib_get_buffer (vm, from[2]);
98 p3 = vlib_get_buffer (vm, from[3]);
100 vlib_prefetch_buffer_header (p2, LOAD);
101 vlib_prefetch_buffer_header (p3, LOAD);
103 CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
104 CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
116 b0 = vlib_get_buffer (vm, bi0);
117 b1 = vlib_get_buffer (vm, bi1);
119 h0 = vlib_buffer_get_current (b0);
120 h1 = vlib_buffer_get_current (b1);
122 next0 = next1 = " ENCAP_STACK "_INPUT_NEXT_IP4_INPUT;
124 label0 = clib_net_to_host_u32 (h0->label_exp_s_ttl);
125 label1 = clib_net_to_host_u32 (h1->label_exp_s_ttl);
128 * Translate label contents into a fib index.
129 * This is a decent sanity check, and guarantees
130 * a sane FIB for the downstream lookup
132 label0 = vnet_nsh_uc_get_label (label0);
133 label1 = vnet_nsh_uc_get_label (label1);
135 /* If 2xlabels match, and match the 1-wide cache, use it */
136 if (label0 == label1 && rt->last_label == label0)
138 vnet_buffer(b0)->sw_if_index[VLIB_TX] = rt->last_fib_index;
139 vnet_buffer(b1)->sw_if_index[VLIB_TX] = rt->last_fib_index;
143 p0 = hash_get (rt->mm->fib_index_by_nsh_label, label0);
144 if (PREDICT_FALSE (p0 == 0))
146 next0 = " ENCAP_STACK "_INPUT_NEXT_DROP;
147 b0->error = node->errors[NSH_ERROR_BAD_LABEL];
150 vnet_buffer(b0)->sw_if_index[VLIB_TX] = p0[0];
152 p1 = hash_get (rt->mm->fib_index_by_nsh_label, label1);
153 if (PREDICT_FALSE (p1 == 0))
155 next1 = " ENCAP_STACK "_INPUT_NEXT_DROP;
156 b1->error = node->errors[NSH_ERROR_BAD_LABEL];
160 vnet_buffer(b1)->sw_if_index[VLIB_TX] = p1[0];
161 rt->last_fib_index = p1[0];
162 rt->last_label = label1;
166 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
168 nsh_rx_trace_t *tr = vlib_add_trace (vm, node,
170 tr->label_exp_s_ttl = label0;
172 if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
174 nsh_rx_trace_t *tr = vlib_add_trace (vm, node,
176 tr->label_exp_s_ttl = label1;
179 vlib_buffer_advance (b0, sizeof (*h0));
180 vlib_buffer_advance (b1, sizeof (*h1));
182 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
183 to_next, n_left_to_next,
184 bi0, bi1, next0, next1);
188 while (n_left_from > 0 && n_left_to_next > 0)
193 " encap_stack "_header_t * iuX0;
196 " encap_stack "_tunnel_t * t0;
197 " encap_stack "_tunnel_key_t key0;
207 b0 = vlib_get_buffer (vm, bi0);
210 * udp leaves current_data pointing at the tunnel header
214 (b0, -(word)(sizeof(udp_header_t)+sizeof(ip4_header_t)));
216 iuX0 = vlib_buffer_get_current (b0);
218 /* pop (ip, udp, lisp-gpe) */
219 vlib_buffer_advance (b0, sizeof (*iuX0));
223 next0 = " ENCAP_STACK "_INPUT_NEXT_DROP;
225 key0.src = iuX0->ip4.src_address.as_u32;
226 key0.iid = iuX0->lisp.iid;
228 /* $$$ validate key comparison */
229 if (PREDICT_FALSE ((key0.as_u64[0] != last_key.as_u64[0])))
231 p0 = hash_get_mem (ngm->" encap_stack "_tunnel_by_key, &key0);
235 error0 = " ENCAP_STACK "_ERROR_NO_SUCH_TUNNEL;
239 last_key.as_u64[0] = key0.as_u64[0];
240 tunnel_index0 = last_tunnel_index = p0[0];
243 tunnel_index0 = last_tunnel_index;
245 t0 = pool_elt_at_index (ngm->tunnels, tunnel_index0);
247 next0 = t0->decap_next_index;
249 /* Required to make the l2 tag push / pop code work on l2 subifs */
250 vnet_update_l2_len (b0);
253 * ip[46] lookup in the configured FIB
254 * " encap-stack ", here's the encap tunnel sw_if_index
256 vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index;
257 pkts_decapsulated ++;
260 b0->error = error0 ? node->errors[error0] : 0;
262 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
264 " encap_stack "_rx_trace_t *tr
265 = vlib_add_trace (vm, node, b0, sizeof (*tr));
266 tr->next_index = next0;
268 tr->tunnel_index = tunnel_index0;
271 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
272 to_next, n_left_to_next,
276 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
278 vlib_node_increment_counter (vm, " encap_stack "_input_node.index,
279 " ENCAP_STACK "_ERROR_DECAPSULATED,
281 return from_frame->n_vectors;
284 static char * " encap_stack "_error_strings[] = {
285 #define " encap_stack "_error(n,s) s,
286 #include <vnet/" encap-stack "/" encap_stack "_error.def>
287 #undef " encap_stack "_error
291 VLIB_REGISTER_NODE (" encap_stack "_input_node) = {
292 .function = \"" encap_stack "_input\",
293 .name = \"" encap-stack "-input\",
294 /* Takes a vector of packets. */
295 .vector_size = sizeof (u32),
297 .n_errors = " ENCAP_STACK "_N_ERROR,
298 .error_strings = " encap_stack "_error_strings,
300 .n_next_nodes = " ENCAP_STACK "_INPUT_N_NEXT,
302 #define _(s,n) [" ENCAP_STACK "_INPUT_NEXT_##s] = n,
303 foreach_" encap_stack "_input_next
307 .format_buffer = format_" encap_stack "_header_with_length,
308 .format_trace = format_" encap_stack "_rx_trace,
309 // $$$$ .unformat_buffer = unformat_" encap_stack "_header,